JavaScript-Projects/Bmi.html at main · srujana-manda/JavaScript-Projects · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>BMI calculator</title>
    <style>
     body{
        text-align: center;
        font-family: 'Times New Roman', Times, serif;
     }
     .container{
        width: 400px;
        border: 3px solid black;
        border-radius: 8px;
        margin: 5px auto;
        margin-top:20px;
     }
     h1{
        letter-spacing: 2px;
     }
     input{
        width:55%;
        padding: 9px;
        font-size: 20px;
        border: 1px solid grey;
        border-radius: 5px;
        margin-left: 3px;
        margin-top: 3px;
     }
     p{
        font-size: 23px;
        margin: 3px;
     }
     button{
        padding: 12px;
        font-size: 20px;
        background-color: black;
        color: white;
        border: 1px solid black;
        border-radius: 7px;
        margin: 5px;
     }
     .description{
        text-align: center;
        margin: 8px;
        font-size: 20px;
     }
     .res{
        font-size: 23px;
        font-weight: 500;
     }

    </style>
</head>
<body>

    <div class="container">
        <h1>BMI APP</h1>
       <form action="#">
        <p><label for="text">Height in cm:</label><input type="text" id="text" placeholder="Enter Height"></p>
        <p><label for="texts">Weight in cm:</label><input type="text" id="texts" placeholder="Enter Weight"></p>
        <button>Calculate</button>
        <div class="res"></div>
        <div class="description">
            <h2>BMI Overview:</h2>
            <p>Over weight: Less than 18.6</p>
            <p>Normal weight: 18.6 - 24.9</p>
            <p>Under Weight: More than 24.9</p>
        </div>
       </form>
    </div>

    <script>

        let btn = document.querySelector("button");
        let res = document.querySelector(".res");
        let form = document.querySelector("form");

        form.addEventListener("submit",(e)=>{
            e.preventDefault();

            let height = parseInt(document.querySelector("#text").value);
            let weight = parseInt(document.querySelector("#texts").value);
            let res = document.querySelector(".res");
            res.classList.add("res");

            if(height === "" || height < 0 || isNaN(height)){
                 res.innerText = `Please give Valid height`;
                 res.style.color = "red";
            }
            else if(weight === "" || weight < 0 || isNaN(weight)){//weight != NaN
                res.innerText = `please give Valid weight`;
                res.style.color = "red";
            }
            else{
                let bmi = (weight / ((height*height)/10000)).toFixed(2);
                console.log(bmi);
                res.innerText = `BMI is: ${bmi}`;
                res.style.color = "green";
            }

        })

    </script>
</body>
</html>